1. Interference effects in sampling particulate nitrate in ambient air;Appel;Atmospheric Environment,1979
2. Intercomparison of samplers used in the determination of aerosol composition;Camp;U.S. Environmental Protection Agency, EPA-600/7-78-118,1978
3. Effect of environmental variables on collection of atmospheric sulfate;Coutant;Envir. Sci. Technol.,1977
4. A comparison of three particulate metrics in four U.S. cities;Evans,1981
5. Investigation of the relationship between IP (da ⩽ 15 μm) and TSP mass concentrations in six U.S. cities;Feldman,1981